Killalea State Park's overgrown lagoon is to get a facelift, courtesy of a new volunteer group that will get down and dirty to clean up the popular spot.

The Friends of Killalea State Park have their shovels poised to give the run-down site a much-needed makeover, preparing to meet monthly to clean up the location.

The group will spend its working bees removing mountains of lantana, planting native species and clearing the park, particularly the valley area near the lagoon.

Project manager Amelia Westhoff said the group ultimately hoped to completely revegetate the valley with native rainforest species, restoring it to its original condition.

"The area is in need of a clean-up, there are a lot of weeds that have just been left to run rampant through the park," she said.

"It all comes down to funding ... there was funding for an initial clean-up but you need money to do that follow-up maintenance so we're hoping our funding will really help with bush revegetation."

The project has federal government funding, which Ms Westhoff said would mainly be used to implement a long-term bush regeneration program and increase community volunteerism.

"I think there are quite a lot of people out there who are interested in keeping the area beautiful," she said.

"The park is a significant asset to the Illawarra - it's home to a lot of recreational activities, important flora and fauna and endangered species that need protecting."

The group hopes to attract volunteers via its Facebook site, which already has 50 likes.

"This project is for people of all different experience levels, we're not just looking for green thumbs," Ms Westhoff said. "We want people of all different backgrounds and ages who just want to get out there and help."

The group will carry out tree planting on Saturday from 9am.

To get involved, visit the Friends of Killalea State Park Facebook page.